Cutting tool



April 1932- I L. SKEEL 1,854,632

CUTTING TOOL Filed Oct. 26, 1929 LEW/5 /ra'L.

Patented Apr. 19,. 1932 PATENT FFICE LEWIS SKEEL, 0F MEADVILLE, PENNSYLVANIA CUTTING TOOL Application filed October 26, 1929. Serial N'o. 402,695.

This invention relates to tool holders of the floating type.

The invention forming the subject of this application will be found to reside in simple means by which limited misalignment of the tool with respect to the hole in which the same is intended to work is compensated for, to the end that the tool and the holder therefor are relieved of the strain that would otherwise be borne by these parts as a result of such misalignment.

Another feature of the invention will be found to reside in the construction and arrangement of parts by which a highly simplified, economical and rugged assembly is produced.

Other objects and advantages will be apparent during the course of the following description. In the accompanying drawings forming a part of this application and in which like numerals are employed to designate like parts throughout the same,

Figure 1 is a vertical sectional view through the improved holder,

Figure 2 is a group perspective of the holder.

In the drawings wherein for the purpose of illustration is shown a preferred embodiment of the invention, the numeral 5 designates a shank or attaching member having conventional or other means by which the same may be attached to a suitable source of power such, for example, as the driving spindle of a drill press.

As shown in Figure 1, the forward portion of the shank 5 is enlarged diametrically and is embraced by a collar 6, the forward portion of the collar being extended beyond the forward terminal of the shank to cooperate with the shank in the formation of a socket adapted for the reception of the motion transmitting means to be described.

Figure 1 also illustrates that a tool holder or driven member 8 has the rear portion there' of enlarged diametrically and received within the socket defined by the cooperating members 5 and 6 and that a driving connection is established between the driving and driven members 5 and 8 respectively, by keys 10 and 12.

The keys 10 and 12 are of substantially semicircular or segmental formation and the straight edge portions of the same are received within transverse 0r diametrical keyways 14 and 16, respectively, in opposite sides of an intermediate floating motion transmitting member 20 preferably in the form of a disk. The diametrical key-ways 14 and 16 extend at right angles to each other and open at opposite ends out through the periphery of the member 20.

It will be seen that the diametrically enlarged forward portion of the driving member 5 and the similarly enlarged rear end portion of the driven member 8 are formed with key-ways, the bottom walls of which are curved to conform to the curvature of the keys 10 and 12 so that a limited universal movement of the driven member 8 with respect to the driving member 5 is allowed.

In this connection,it might be pointed out that the diameter of the intermediate driving member 20 and the diameter of the enlarged rear portion of the holder 8 will be found to be slightly less than the diameter of the socket within which these parts operate so that limited pivotal or lateral sliding movements of the holder is allowed. The fact that, when the driving and driven members 5 and 8 are in alignment, the members 10, 12 and 20 operate about a common axis defines a universal mounting by which com pensation is made for angular misalignment of the tap or the like with the work.

In further adverting to the universal mounting of the holder 8, attention is directed to the fact that the radius of each driving key is greater than the combined maximum depths of the key-ways in which the same operates so that the intermediate driving member is spaced from the opposed faces of the driving and driven members. This, of

course, allows of the desired freedom of movement. Since the keys l0 and 12 are of segmental formation a constant and maximum area of contact is provided between the keys and the side walls of the key-ways. For example, when the tool holder 8 is operating at v, surfaces of the ring 24: and the inwardly flanged portion of the collar 6 are similarly beveled and allow a limited universal movement of the driven member 8 with respect to the axis of the driving member 5.

The construction previously described, combined with the fact that the driven member 8 and the floating member 20 are normally spaced from the side walls of the collar 6, allows the driven member 8 to operate on an axis spaced laterally from the axis of the driving member 5.

The highly simplified mode of assembly forms an important part of the invention and in explaining this it is pointed out that the driving keys, the intermediate driving member 20, the radius ring 24, and the en larged rear end portion of the holder may be positioned within the collar 6 and the collar then applied to the diametrically enlarged forward portion of the driving member and secured thereon by a tapered pin 26. The tapered pin 26 will be found to be extended through registering openings in the collar 6 and the forward portion of the driving member 5 and provides a simple means by which the motion transmitting means, along with the collar 6, are held in assembled relation.

In operation, the driving member 5 is, of course, attached to a suitable driving means, while a tool such as a tap or a reamer is connected to the driven tool holder 8. Should the hole in the work be found to be out of alignment with the axis of the driving member, the tool is, nevertheless, allowed to fol low the hole without the strain that would otherwise be transmitted through the holder 8, the driving member 5 and associated parts. That is to say, if the hole in which the tool is intended to work is found to be out of parallelism with the axis of the driving member 5, the arrangement of the keys 10 and 12 with respect to the intermediate driving member allows for full compensation for this.

It will be recognized that the keys 10 and 12 are movable endwise in consonance in the associated key-ways to allow the tool to operate about an axis parallel to the axis of the driving member 5. Of course, such endwise movement of the keys in consonance will take place to adapt the tool to operation in a hole found to be offset with respect to the axis of the holder and this automatic adaptation of the tool to the particular condition encountered will relieve the operator of the necessity of moving the casting or the like being worked to position the hole therein in longitudinal lzilignment with the axis of the driving mem- Should the hole in which the tool is intended to work extend angularly with respect to the axis of the driving member, the universal mounting of the holder allows the tool to follow the hole without excessive strain on the motion transmitting mechanism. This is made possible by the connection between the keys and the motion transmitting members 5 and 8 combined, of course, with the contact of the pivoted ring with the beveled inner face of the inwardly flanged portion of the collar 6.

The invention forming the subject of this application is characterized by simplicity, rigidity, and economy, all of which features are highly desirable in a device of this character.

It is to be understood that the form of the invention herewith shown and described is to be taken merely as a preferred example of the same and that such minor changes in arrangement and construction of parts may be made as will remain within the spirit of the invention and the scope of what is claimed.

Having thus described the invention, what is claimed is:

1. In a tool holder, driving and driven members having key-ways, an intermediate motion transmitting member between said driving and driven members and formed with key-ways, substantially semicircular keys in said key-ways and establishing a driving connection between said driving and driven members, the radius of each of said semicircular keys being greater than the combined depths of the key-ways in which the same operates whereby the intermediate motion transmitting member is normally spaced from the opposed ends of the driving and driven members.

2. In a tool holder, driving and driven members having key-ways, an intermediate motion transmitting member between said driving and driven members and formed with key-ways, substantially semicircular keys in said key-ways and establishing a driving connection between said driving and driven members, the radius of each semicircular key being greater than the combined depths of the key-ways in which the same operates whereby the intermediate motion transmitting member is normally spaced from the opposed ends of the driving and driven members, the key-ways in said driving and driven members being curved to conform to the curvature of the semicircular keys whereby the driven member may partake of a universal movement with respect to the driving member.

3. In a tool holder, driving and driven members having key-ways an intermediate motion transmitting member between said driving and driven members and formed with key-ways, substantially semicircular keys in said key-ways and establishing a driving connection between said driving and driven members, the key-Ways in said driving and driven members being curved to conform to the curvature of the semicircular keys whereby the driven member may partake of a pivotal movement with respect to the driving member, a collar embracing the adjacent portions of said driving and driven members, and a radius ring mounted on said driven member and engaged with said collar. 4. In a tool holder, driving and driven members having key-ways, an intermediate motion transmitting member between said driving and driven members and formed with key-ways, substantially semicircular keys in said key-ways and establishing a driving connection between said driving and driven members, the radius of each semicircular key being greater than the combined depths of the key-ways in which the same operates whereby the intermediate motion transmitting member is normally spaced from the opposed ends of the driving'and driven members, the key-ways in said driving and driven members being curved to conform to the ourvature of the semicircular keys whereby the driven member may partake of a universal movement with respect to the driving member, said keys being movable endwise in the key-ways of said intermediate motion transmitting member to allow the driven member to operate on an aXis parallel to the axis of said driving member.

5. In a tool holder, driving and driven members arranged end to end and having the adjacent portions thereof enlarged diametrically and formed with concaved keyways, an intermediate driving member floatingly mounted between the enlarged portions of said driving member and formed with diametrical key-ways opening out through opposite edges thereof, substantially semicircular keys in said first and second named keyways, a collar secured rigidly on the enlarged portion of said driving member and extended beyond the same to cooperate therewith in the formation of a socket receiving said keys, said intermediate motion transmitting member and the enlarged portion of said driven member, the forward portion of said collar being flanged inward, and a radius ring confined between the diametrically enlarged portion of said driven member and the inwardly flanged portion of said collar.

In testimony whereof I affix my signature. o0 LEWIS SKEEL. 

